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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72773733913014b54348b8465e10afcc9e1049cc15c7e00a92cfa5e3426415aa' 
  AND token = 'ocjK0QaWfxep+ROVJr1SJzK/jEPk/MOpDxJAW+cYjj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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