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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf8026dfcebd2ca66b60ffd529ed88c2a5faa3851f6ee0a871db7a7f6778f87' 
  AND token = 'Cn99MToIN2snhAuQX42k9OQjJzJkHo8+6Rzr7L0RV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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