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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a35d5170d97d65239af70261e2464bfa1129f8d9496e3e84e454d2f9e7e95c3' 
  AND token = '0ta1O7aWfQVL4hyf0wAvLUzaaaxFSS1lV/NTMeW0cjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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