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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a9a90cd72f3bfa58803d0c95604a045bc019d667f421e531f5ba2fe23dec85' 
  AND token = '93kcah0zg2TIoU9hyTcRb5oSLpMYqXiQGDS/YhmSuFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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