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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1903e38a9f5709e192b1ea840d9118613859773d615e716a141f72a14e518e14' 
  AND token = 'cAELmMIDo+iyOmptdTNzsYUm6YPC+iSPERCmRKGXGA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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