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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fedd92140a3ac3562fd3a9fa8dda5400cd8bf2c195911fbce7e67cac79f3898' 
  AND token = '+yspimSt7aSS+IkpZZo40vL99y30+273+hsmtjb1jwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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