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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2de221cf7c32fd3c9a3fc0da88a52aa8f165fd86ef35fa39dfc038dc84a836' 
  AND token = 'ZHJysrgpFq1T7RRQpcrdI6R6aE8DsAN/0Y1wbLWxI2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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