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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66867caa8b65bfe2b737a872425366e74195053f981405e6fe91db97f18ec85' 
  AND token = '+x1T/pTM10TOEHWEWkii66BiGKQeiK1GYzFMacbULB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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