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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc0591af1eb39e38e3916667a93df6c4c458f9a2dca5dc618d469911a5ad998' 
  AND token = 'O4mocOBJYNA0aspDuJV6rpC4rxjqD0MCoDOwhDZmbDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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