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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ed4a8f4c6c5a4131fbc74cafaac98b27e40c0d15512edab802bdf34aa0d29c' 
  AND token = 'b1XjJmyy9QeHihP8wOA4LfB3R7KniLRxr0DFXxrdI+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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