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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8d44d9d0c923bb7b5a57a5fd03e5f1e656abc8d87999df1483b30cae580ab2' 
  AND token = '9Fvs3sgjBkJvayRnRLUsSIhvRxQCJb7W1nGrRdEztI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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