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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45843167b5a26bfc5ae265b108b44b06b4239e26f9611fe01c85466258a7e40' 
  AND token = 'Pi4PSyhtn7H7ecNrHdQ/EBkDsBlN6O8up66lw3eVb2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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