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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be63b4030b1c420c18d4c493a5a58e079d5c9f3e2cefa312be61b9cf2b348265' 
  AND token = 'hnYpRyN6bnKgGsE6DQef8ebACVH7VEPbIfZAmDeMvUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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