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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31521bc036d874a30c4b7c03d20267cdbaff6d6c12dd33865ec3a77bc2bb0eee' 
  AND token = 'edZG8wOs8tpvh6l7f/LtysfUvKwdqbanAuIXR96E4fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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