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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c6443cd9f6b81d4273d6693f8933da43a7d3b6d69dafd08efc32c33ed610c1' 
  AND token = 'LvoG70gDvZWqQa3Uj+BilFa7qeK7FIRKFC/2zfJ8IN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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