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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ca31643ff89821028c7d76bfa72e4bb0807175a7ae546c3916b506272993d9' 
  AND token = '/UdiDyVdU/17/+JnUjkM1+0h8LtP6cPVFRL0s/tsDQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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