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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d99a88f3c15d49a44b9bb319d1078615e7229acce11899e3802a2d5161731e' 
  AND token = 'SGiW8SjEIOgsbZDM5LVHuz3G1kqURGvAVcZvOpeadUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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