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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da31863fbf2415e2df2ebf33054cbbcc56710977658c14b127c7715a5d84aafd' 
  AND token = '4USAMGjgMgxGuvuxdqbD37/4LrnAHMLcTwyUHspHEZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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