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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71befb93873d60ad5e92e5376cacea19865bbfb8dc5d933dc53f3f2ba2d36aa1' 
  AND token = 'nKiNzy6gimfXRh8s8udxuDyUpMhJFzz1QEPua65InTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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