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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97fa2a9fd6c46d7cb185c5178e64f3ecdff9f0df64dc69ed446bae41e4d9ad2' 
  AND token = '28MzOR/HdTpDKGaM7vpVu2EIzlrzM0GVlXthmfNpDBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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