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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73b6fa36f9691eaf588def4725cf5a326dc2dcf2e5ba413e5232ca1da742763' 
  AND token = '9pVE6vtUY/m8nAE2uyfdpWA5e7j6+ST5XF4wkcBjRLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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