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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24725962e8ed7258d8a0a5f2424210a86656110bbed9ef176c98b188a6919c5' 
  AND token = '4WENdzLafJfE57Y67qg3iW0gIZdDK0pUji72I3bVZLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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