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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b1e22db2996c1a61a02fa7e60c7d99a343558dcce29fbc1e25cfbda3780bc9' 
  AND token = '9jBa4lg9CNxEGxAj/Yp274NNFvLqNeI5jNPm+wJcQ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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