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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a0a106cabd06154ccd9dd985d7c5ff0267088d48eedd27fc6eea603d1f206f' 
  AND token = 'tm7/x5QGJOghd5u4gzLKirYv7GtW0lBm/NGG1Og9T/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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