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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d64c97aea84567250d12f40c9e7a9d591997309d5e53bfdeb7e06fc909bb06e' 
  AND token = '0kv1dCmxth6Z4Yr1Pa54Mzj01Xe6wM/8BGapWQiHkoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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