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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0cefa5ad4b9c8a97ff6f2a769570b0a2db984ab3ad8ee831d4162b1620fd10' 
  AND token = 'i3WWrPtxRqA6g453z7Bv/5f4Cr3XUlNezjUZHDhXnzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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