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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54087561a0d4bf67b98d101ced2e47a4a3e0b76182ecb7f483d076dc5df3f39e' 
  AND token = 'fM0UgX6SvqfqZmyn+v8iJnG97v6I1hKkB4QApPSKME4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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