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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80aa6fcb4d48dfb90570b00a1b67c0aa5f8c218cf896ce71f734a42105085ecf' 
  AND token = '3n5zXnMa/uZB/5nSz9mjifXAJ9g5UT8dhXlde8/JaxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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