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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1082cb6b2acf287613a6a6ad45ba198ff604564fc98f1b85fa3eba0a07d936' 
  AND token = 'rqR1/z0WAaj9FBx+dHpuYcBIJ73CNBoewqNGqASWtaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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