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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bea88ba7901cdd305d19b6c8fe8bf7d6617c615206b66554d24b1614f449608' 
  AND token = 'eBW3jUNpZW68Y6WfGJxEKS69WVanBSss865B1bSpvGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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