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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7a1141856d4f687498630b2c0e78d1033efe1502803005f740fb27f76fde76' 
  AND token = 'CfBp5Uv8fgTjG5lKLQ5GtUH9QXKU7sTn280IL02eDtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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