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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64fe81bf9240ac43047e5d24a7697569d95f11a823273356653c836d2d7da23' 
  AND token = 'ZvrtNDBNOA2itpGrGg/9v418VaUE0CEah7LhdAMPERs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}