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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfc993a4712a324c9847fbeb8a5f34002183f9b31ed6827fa18ffa7e0fd4c90' 
  AND token = '6wgJCRo7IYTZV4+Pbp06gWdiunPw4MNI5+RNyQ9w53o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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