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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2ba68a1f2eb7b1dda0ecddb2dc4532fd73d46bdfab58fca092c1b265677970' 
  AND token = '+wsl3brqggiJAvnt0xaThYPvIdOjfajfhkyBLgZdHBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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