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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6be4552cdd03517d67d36442e3b14e80358e6ed7c301b91ef4c0b3c2cb5d45' 
  AND token = 'DCM45f0LbUorQvXm7NgOZk3M21B0j2MrHDQPykw3G+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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