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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fbe6d73f1099bce28d0871c95f4b06a9e3f3b0eb63fead32297618bd497527' 
  AND token = 'O3et92zQG+TPm4ATYf5Mg5SY8nMKLk3Q+80+wxVEdp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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