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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56edf97f641a3b56cd2d93816e31dd9d1171a456bf2b8772e3f4fce121bebee5' 
  AND token = 'nzLUWntcOClmOv+YlOK879xboS6aZNX1O2SKHHBUsOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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