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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa5f892950ab268173fde9e342f5b3712b0733f7394d6feced404f2e5aacb0c' 
  AND token = 'UehKWuaJHObV6y1JukaQSX5aLdV8f+O8C28iZ7j3wL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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