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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83301b880eb7413bf003d51f0881de40314b21f387212281e6df10e020df354b' 
  AND token = 'hqNmwo2JS+KPLwOA+C4S2Slo/yH4PO1lT3I0Q32fFPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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