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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba663802a3836ff89874c0a4d2c4a00ab215bc935792043a935934a7a536ec0' 
  AND token = '4XvMnQmXOONNZu2HMHFupQbNeq/+X/S6qcQbSMUsU8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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