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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86be6474b3e39ba8779dbca1ef86447ce93dcd6f75d5888903cb9bc9c9b2976a' 
  AND token = '/92ypaWXK8km+G6/5ccoSi6pPQUPkVRX/I8PL1oSOjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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