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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65ec4e41d98921ca4fd34b48c53d90de8218c1f74b93d793eb0c5e1d2effb8d' 
  AND token = 'Mx6ASi2n2PtehFA2Wktnd0iY5bxexsRC8E+2gT0a/so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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