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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ada75463a7be575527e6b398a8b2b1b763e71750d632880b5fd538f0afebb5b' 
  AND token = 'Xz975FlcOFwmuG/C1Y5qHqRV6lIduCFPL30bWV183yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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