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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c401c2209992dc539535d25e73a3df26433d62fb91765a4a40a8fc55db538134' 
  AND token = '/dcGW/nQ/OjinFpauyITYud1/GMQEOJjRDmxpRGvs/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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