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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02f3df480f5fe22f32d3d69462cd76fda1753e556d7950077a7d75976213a1b' 
  AND token = 'he18YvfXKV7eANBEWMhYTT78UGMLfOLzVvZDWAfLEJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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