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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd612f5f0b975a4330025df52d2ed8c4288136f8b34293a93f77c21cb642be3d8' 
  AND token = 'NmHvVWM7LAorvUFhzlM4AKOH9eSlNOD2cXZ0XCT3Y/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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