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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b4a9b0a0128c961a0e3bd011e2cc3b1c8ea89f50c48c295a47f610e83d204d' 
  AND token = 'T71MCncvE4sFAnUYxzcde2gmDd3vQxRhDqe23mwEMV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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