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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7eaddbd84dfa7a0e8ad07dc5fa7fc033340e9975d8b1f733600473aee21881' 
  AND token = 'capXkdGspl46hihuPg56hBoy84JbE687Gbfhb93/Wqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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