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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5151f4a082998cb8de86b4325f0bcedd84e5509c80d18951e22358540b80413c' 
  AND token = 'wZtp92CroUfXrrmLwXYcDYONx2xVWzXKP56BHbSukT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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