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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160634cca5b794d0ff69cf3be1dea5aa5be1636cc45c033562717e20794e2081' 
  AND token = '+73uWakFNmKILssmEjnW/A0Q8bwuZqauumq1xlxf6oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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