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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10a8773dc2cb4dff74ac0d90dba6c0587507917d87cbb7d27f54d2f9b95887e' 
  AND token = 's/CKV2U1knnwSWL7U5mxe+EXOT2Hc7oUWnkLxhIwfAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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