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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ea348d150ed25fdb95de001ff4f6f05d08dfcec48fd11349f9287f8fbb8ff9' 
  AND token = 'PapBXXGtZ3M55gbxUpzs73cF3LUwOk2EGEhlLX/xCxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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