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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497134fa1a10c446a76b8a8d559532484bd7bb4ec125ee2db0bc372627e86c9c' 
  AND token = 'ZCXZoG4PkOVdMegVvU48/7YkQOrb1i0ijxh8hsoK7Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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