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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73962162e599425d0886d209dd147f8e3ffd5c323a9dbdb37d4e41995729aa54' 
  AND token = 'zt/bQ3UN3eNJXAA5enAiBu9XpWHUgOWq3DXd6umSH9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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