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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a00bd6bdbd1c08449da126566d62104b7a9b6660f1bc1be2b614e7039d0e09' 
  AND token = 'BOj9x7A/buloiutNCSRAypYtCshoR16HsEIInHSk5HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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