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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c431728170ce6ea8f47e7c4913e93b82d424490fdc76c1e52c57bfcd36d4ef6' 
  AND token = 't6Olp654+vzfvdJu0JQBb1iSgEnH0gHgnvbEUEvSNFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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