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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600878da1be01bcc325944ba7096c3e2247293e46ae972ec5bcf4e7b1c40f0bc' 
  AND token = 'L0TE5/Ps1KcQxAWv24vt1KsUO9Zb442nyw5kwSXJCwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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